Stability of magnetic nanowires against spin-polarized current

TL;DR

This paper investigates the stability of magnetic nanowires under spin-polarized currents, identifying the critical current for instability and how it depends on wire geometry, supported by theoretical analysis and micromagnetic simulations.

Contribution

It provides a theoretical framework for understanding how nanowire geometry influences the critical current for magnetic stability, validated by numerical simulations.

Findings

Critical current depends on wire size and shape.

Dipole-dipole interactions significantly affect stability.

Numerical simulations confirm theoretical predictions.

Abstract

Stability of ground magnetization state of a thin magnetic nanowire against longitudinal spin-polarized current is studied theoretically with dipole-dipole interaction taken into account. The critical current, minimum current at which the instability of the ground state develops, is determined. Dependence of the critical current on size and form of the transversal wire cross-section is clarified. Theoretical predictions are confirmed by numerical micromagnetic simulations.